docs: def get_object(self, identifier, mask=None):
          """Get a Reserved Capacity Group
  
          :param int identifier: Id of the SoftLayer_Virtual_ReservedCapacityGroup
          :param string mask: override default object Mask
          """
          if mask is None:
              mask = "mask[instances[billingItem[item[keyName],category], guest], backendRouter[datacenter]]"
          result = self.client.call(self.rcg_service, 'getObject', id=identifier, mask=mask)
          return result